Improvement in vacuum-boxes of paper-making machines



J. L. SEAVERNS. VACUUM BOX OF PAPER MAKING MACHINES. No. 39,500.

Patented Aug. 11, 1863.

I I "II/III'II)IIIIIIIIIIIIIIIIIfll/l UNITED STATES PATENT OFFICE.

J. L. SEAVERNS, OF VVOROE STER,IMASSAOHUSETTS.

IMPROVEMENT IN VACUUM-BOXES OF PAPER-MAKING MACHINES.

Specification forming part of Letters Patent No. 39.500, dated August 11, 1863.

To all whom it may concern.-

Be it known that I, J. L. SEAVERNS, of the city'and county of Worcester, in the Stateof Massachusetts, have. invented an Improved Paper Machine Vacuum-Box; andI do hereby declare that the following, 'taken in connection with the drawings which accompany and form part of this sp'ecificatiomis a description of my invention suflicient to. enable those skilled in the artto practice it.

consisting of the introduction of rolls to sup port the wire apron and to reduce its wear.

My within-described, invention consists in an improved application of the wire apron bearing-rolls to the vacuum-box.

In the drawings illustrating my improvement, Figure l is a plan; Fig.2, a longitudinal section in the line at 00, Figs. 1, 3, and4; Fig. 3, a vertical cross-section in the line 3 y, showing in elevation the parts beyond, looking to the left; Fig. .4, avertical cross-section taken in the line 2 a, showing in elevation the parts beyond, looking to the left; Fig. 5, a section taken in the line w '20, Fig; 3. Fig. 6 cont prises two views of the moving cheeks. Fig. 7 comprises two views of the.packing-plates. Fig. 8 comprises two views of the packingleather, and Fig. 9 shows a modification of the packing and the arrangement of the movable cheeks reversed from that shown in the other figures.

In the box a, near its ends, there are fixed checks 1), which are stationary and provided With pieces a, in which bearings are formed, which pieces are adjustable in height by setscrews 01, and are held in adjustment by clampscrews 0. The deckle or movable checks are marked-f. The rolls y pass through these and are packed by cup-formed leather packings h, (see Fig. 8,) which are held to the movable cheeks by the plate 2'. (See Fig. 7.)

The diameter of the rolls. just cuts through the upper surfaces of checks f, and by means of the screws d and e the tops of all the rolls.

are brought and maintained exactly in theplane of the top of the box a. At each end of a there is a'screw-shaft passing through and connected to the box, as shownin Fig. 2, through the stationary cheeks and working in a nut, j, fixed to f. Rotation. of these screws thrusts the movable cheeks toward or draws them from the center of the box, and

the distance of the cheeks f apart determines the width of the paper, as the deckle-straps move on these checks. I apronbeing'less than the distance between the outer bearings of the rolls, it will be seen that there are no ends or corners of..rolls to act destructively on the apron. It will also be seen thatthe tops of therolls throughout their whole lengths can be maintained perfectly in the plane of the top of the box, so that there can be no saggin got the apron from its edges to its center. vided with wide flanges, which fit closely the nicely-finished surfaces of the inside of a. The spaces between the ends of the box and the movable checks are kept filled with water, so-

that thereby. air is prevented from passing into the space between the cheeks f to'vitiate the vacuum formed therein, for this water" keeps the cup-leather packin gs closely pressed around the rolls and lubricates the bearing-' surfaces in these cheeks, so that if slight leaks exist water, instead of air, will pass into the space in the box between cheeks f. The holes --to receive the rolls as well as to admit the packings. I

By making each movable cheek to ex tend entirely across the vacuum-box, and to correspond in shape with and tit accurately into and against the innersurface or sides of the box a, the movable check in itself forms a partition, separating the whole water-space between the cheeks b and f from the vacuum"-v space inside of or between the opposite cheeks f, and it is in this respect different from a construction of such machines wherein several The width of the wire The movable checks are pro cheek-pieces are employed distinct and separate fromeach other, these latter being actuated by. different screws and requiring. tronblesome and expensive packingto preserve the vacuity of the space between the cheeks. Besides this, where separate checks are employed at each end of the box, they require separate screws to operate them, and it is very.

difficult to preserve with accuracy a strictly corresponding or. simultaneous outward or inward movement of the cbeeksa point of much importancein'the operation of the inachine in guiding thedeckle-straps.

I claim- I I '1 Thecombinationpvith the vacuum box of a paper-machine, of aseries of rolls supported in stationarybearings at each end, and provided at each end, inside of said bearings,wjth

a 1073MB cheek, packed where the rolls pass through it, when said check is made continuous or to fit closely in and against the sides of the box, as set forth.

2. In combination with the rolls of apapermachine vacuum-box, means for adjusting-tho height of the stationary bearings, for the purposespecified' In witness whereof. I have hereunto set my hand this 14th day of February, A. D. 1863. 

